Larry,
I have the true 292 manifold that's generally used in larger trucks - it has the 2 1/2 inch rear dump. Plus the individual exhaust passages are larger.
Chester,
Not necessarily so. It depends on what type sound you're looking for. I personally don't like the "split six" sound - at all. I prefer the deep low, "near v8" sound. I believe that using the single manifold, along with keeping my single in/dual out Flowmaster, will preserve my current "near v8" sound that I have gotten with the long tube headers.
-ftyler
